Hi Thomas,
No worries, I mean your doing this for the community I could hardly blame you for not responding fast enough ^_^
Si basically yes, if you install the plugin, then start Cura while having the 3d expérience open, it will not open the 3d link window that allows you to attach your 3d expérience session to Cura, and it will crash in the Cura Plugin loading.
I did not test to attach the 3d expérience session then close Cura, open 3dexp and reopen Cura, that might work, not sure... At the moment I have the plugin removed as I do not import anything from 3d exp for now, but I'll have a look if I have time.
Have a good weekend!
Mischa